2 full racks baby back pork ribs (trimmed of excess fat, patted dry)
Steps
Gather the ingredients. Preheat the oven to 250 F.
Combine the brown sugar, salt, paprika, pepper, chipotle, thyme, mustard, garlic powder, onion powder, and cayenne pepper in a small bowl and mix.
Place each rack of ribs in the center of its own large piece of heavy-duty aluminum foil and apply the dry rub to each side of the two racks (more so on the meat side).
Wrap each rack in foil and place the two foil-wrapped racks on a baking sheet and place in oven.
Bake for 2 hours.
Remove the ribs from the oven, and, using tongs , open the foil. Place racks on one piece of the foil on a baking sheet and brush barbecue sauce on both sides. Turn up the oven temperature to 350 F.
Return ribs to the oven. Continue cooking, brushing on more barbecue sauce occasionally, until the ribs are fork-tender and well glazed, about 30 to 45 minutes.
Remove and let rest for 15 minutes before cutting and serving.
Cut ribs can be tossed in additional sauce if desired.